/*
 * Copyright 2020 OPPO ESA Stack Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.esastack.restlight.core.resolver.exception;

import io.esastack.restlight.core.handler.method.HandlerMethod;
import io.esastack.restlight.core.util.OrderedComparator;

import java.util.List;
import java.util.stream.Collectors;

public class DefaultExceptionResolverFactory implements ExceptionResolverFactory {

    final List<ExceptionMapper> mappers;

    public DefaultExceptionResolverFactory(List<ExceptionMapper> mappers) {
        this.mappers = mappers;
    }

    @Override
    public ExceptionResolver<Throwable> createResolver(HandlerMethod handler) {
        if (mappers == null || mappers.isEmpty()) {
            return null;
        }
        List<ExceptionMapper> applicable = mappers.stream()
                .filter(m -> m.isApplicable(handler))
                .sorted(OrderedComparator.INSTANCE)
                .collect(Collectors.toList());
        if (applicable.isEmpty()) {
            return null;
        }
        return new MappedExceptionResolver(CompositeExceptionMapper.wrapIfNecessary(applicable));
    }
}
